I have read this book probably 6 or 7 times, and I love it just as much now as I did the first time. The language is simple, utilitarian, 'sandersonesque' if I can be allowed to make up a word, but the world it depicts is vivid and enchanting. The plot apes the first couple of Harry Potter books, leading to a fairly predictable conclusion, but backstory and world-building abound, leading to further entries in the series that are far more complex.
The characters though, the characters are where the true magic of Alexandra Quick can be found. I think a large part of my unbound passion for this series of Harry Potter fan-fic novels can be traced to the fact that I identify so heavily with Alexandra herself. There is a scene where Alex is called to the Dean's office for the umpteenth time, and the secretary (a portrait) rolls her eyes and says 'You know what to do'. That was me in middle school to a T.
Beyond the main character, who can be infuriating at times, there is large cast of complex supporting characters. Lilith Grimm, for example, is one of the most confounding characters I've ever read about. Even after all my rereads, I still don't know if I like her or not, or even whether she's a 'good guy' or a villain. David, Anna, the Pritchard twins, these characters are all more nuanced than their Harry Potter counterparts, and with backstories that are further developed as the series continues. There are so many other characters that I can't even begin to discuss without major spoilers for this and other books, but suffice to say, there is A LOT going on here, and this first installment is merely laying the groundwork for what follows. I had planned to just to reread of AQaTC, mostly to try out the new re-read feature, but now I'm pretty much doomed to finish the entire series again, probably by the end of the weekend.